This is the 17420th most frequent Russian word.
терминалу
"Terminal" (dative case of "терминал").
In this sentence, 'терминалу' indicates the dative case, showing the indirect object (to the terminal).
Я подошёл к терминалу для оплаты счета.
I approached the terminal to pay a bill.
In this sentence, 'терминалу' incorrectly uses the instrumental case ending for a context where the prepositional case ('на терминале') is expected; shows a possible grammatical misstep by a speaker.
На терминалу были установлены новые программные обеспечения.
New software was installed on the terminal.
In this sentence, 'терминалу' should correctly adopt the instrumental case ('через терминал'); highlights the proper grammatical application for this case.